Công thức nghiệm đặc biệt nào sau đây đúng?
A.\(\sin f\left( x \right) = 1\) \( \Leftrightarrow f\left( x \right) = \dfrac{\pi }{2} + k\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
B.\(\cos f\left( x \right) = 1\) \( \Leftrightarrow f\left( x \right) = k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
C.\(\sin f\left( x \right) = 0\) \( \Leftrightarrow f\left( x \right) = k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
D.\(\cos f\left( x \right) = 0\) \( \Leftrightarrow f\left( x \right) = \dfrac{\pi }{2} + k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
A.\(\sin f\left( x \right) = 1\) \( \Leftrightarrow f\left( x \right) = \dfrac{\pi }{2} + k\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
B.\(\cos f\left( x \right) = 1\) \( \Leftrightarrow f\left( x \right) = k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
C.\(\sin f\left( x \right) = 0\) \( \Leftrightarrow f\left( x \right) = k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
D.\(\cos f\left( x \right) = 0\) \( \Leftrightarrow f\left( x \right) = \dfrac{\pi }{2} + k2\pi \;\;\;\left( {k \in \mathbb{Z}} \right).\)
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Hóa Học lớp 12
